unalterable

Definitions

Not capable of being changed or modified.

Fixed, permanent, or incapable of being altered.

Examples

The laws of physics are considered unalterable by most scientists.

Once the contract was signed, the terms became unalterable for both parties.

She held an unalterable belief that honesty was the foundation of any strong relationship.

Synonyms

immutable fixed unchangeable permanent irrevocable constant set

Antonyms

changeable mutable flexible variable alterable temporary fluctuating